BBC Trust chairman Lord Patten has said a "great tsunami of filth" broke over the corporation's Director-General, George Entwistle as he tried to deal with the Jimmy Savile scandal just eleven days into his new job.
He told Radio 4's World at One programme that the BBC's main concern "is to get to the bottom of what happened".
Amid the fallout from the Jimmy Savile scandal the BBC is investigating nine allegations of sexual harassment among staff and contributors.
BBC boss George Entwistle has spent almost two hours taking questions from MPs about the corporation's handling of the Savile scandal.
Ex-BBC boss Mark Thompson has told ITV News he will help with any inquiry into the corporation and its handling of the Savile allegations.